ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 151
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ez80f92
Manufacturer Part Number
ez80f92
Description
Ez80acclaim Flash Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.EZ80F92.pdf
(261 pages)
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PS015313-0508
Clock Synchronization
The slave-transmitter must release the data line to allow the master to generate a STOP or
a repeated START condition.
All masters generate their own clocks on the SCL line to transfer messages on the I
Data is only valid during the High period of each clock.
Clock synchronization is performed using the wired AND connection of the I
to the SCL line, meaning that a High-to-Low transition on the SCL line causes the relevant
devices to start counting from their Low period. When a device clock goes Low, it holds
the SCL line in that state until the clock High state is reached. See
The Low-to-High transition of this clock, however, may not change the state of the SCL
line if another clock is still within its Low period. The SCL line is held Low by the device
with the longest Low period. Devices with shorter Low periods enter a High wait-state
during this time.
When all devices concerned count off their Low period, the clock line is released and goes
High. There is no difference between the device clocks and the state of the SCL line, and
all of the devices start counting their High periods. The first device to complete its High
period again pulls the SCL line Low. In this way, a synchronized SCL clock is generated
with its Low period determined by the device with the longest clock Low period, and its
High period determined by the one with the shortest clock High period.
by Transmitter
Data Output
Data Output
from Master
by Receiver
SCL Signal
START Condition
S
Clock Pulse for Acknowledge
MSB
Figure 35.I
1
1
2
2
C Acknowledge
8
9
Product Specification
Figure 36
I2C Serial I/O Interface
2
on page 145.
C interfaces
2
C bus.
144
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